Sound Mixer Panel

Hi I Have Just Started Using Linux For The First Time,& Wish To Have Access To Mixer Panel,When I First Clicked On It,It Stated That It Could Not Mixer,Perhaps You Have No Permission To Access Mixer Device,Login As Root And Do A('chmod a+rw /dev/mixer*') To Gain Access

or indeed, try this first:
chmod 777 /dev/mixer
chmod 777 /dev/dsp
But normally aumix should work.
You can also try closing all applications
that could alreayd use this device by
using fuser as root:
[root@localhost /]# fuser -k /dev/device
for example: fuser -k /dev/dsp
kill's all applications that are using /dev/dsp